As your business evolves and you experience more you will probably develop some sort of addendum to add to your lease to cover things you would never think would be issues.

To clear up a few things: @Lincoln Coverdale - There are over 100,000 species of mold that scientists have identified, and they estimate there are hundreds of thousands more species they have not identified.

I am glad to say we grow and evolve every year. 

This space is continuing to evolve and the rate of change is pretty quick.

Now when making the current analysis to the land we found that: there is an area at the end of the property that is considered wetland, there is a storm pond in the middle of the property of about 1,000 sf and there is a little chance that the land may be house of an endangered species. 

While I use Evolve and they send their emails for checkin, I supplement theirs with my own Mailchimp campaigns that provides further info on their stay at my propertyies  All of this is powered by an automation engine I built using a free service called Automate.io that leverages my Google calendar to send tailored emails to my guests throughout their stay and automatically notifies my housekeeper of new and updated bookings.At this point, barring a broken toilet or something, I only have to spend about 4 minutes on each of my bookings

Usually it's cheaper to fix it than find out what species of mold it is.  

Society is evolving into a place where you aren't able to trust anyone.

I'm sure my investment style will evolve over time, but I plan to start my investment career with either a middle-range single family home or a duplex/triplex.

If something urgent does arise, it helps to have a local STR manager that can handle it for you rather than larger national companies like Vacasa and Evolve - that tend to be notoriously bad at handling issues for owners.